Oh I think it's some sort of dream walking or weirwood vision too. It just didn't look like the same scene we got with the baby. With the baby the NK didn't have that thing on his back and I think he was dressed differently too. Here looks dressed like he was in the Hardhome scene, but again he didn't have that thing at his back. Still haven't gotten a chance to watch again, I may spot something to give us a clue, but I doubt it.